Joint or coupling for posts



May 12, 1925. 1,537,197

' O. SCHUBERT JOINT OR COUPLING FOR POSTS Filed Jan. 15 1925 lhucnfir.

AJTGYRCH.

latented May 12, 1925.

UNITED STATES PATENT orrics.

OSKAR SCHUBERT, 0E FBEIBURG, GERMANY, ASSIGNOR TO GEBR. HIMIVIELSBACHAK'IIENGESELLSCHAFT, OF FREIBU'RG, GERMANY.

JOINT OR COUPLING FOR POSTS.

Application filed January 13, 1925. Serial No. 2,240.

To all w/zom it may concern.

Be it known that I, OsKAn SoHUBnn'r, residing at Freiburg, Baden,Germany, a citizen of the German-Republic, have invented certain new anduseful Improvements in Joints or Couplings for Posts, of which thefollowing is a specification.

The object of my invention is to provide improved means for connectingpoles or.

lengths of timber for making composite posts. For. this purposesubstantial strength and rigidity are required, and it has been proposedto use corrugated metal coupling plates, screwed to the timber, and insome cases plates which are intended to touch the timber only at theired,-? es,,so that there is a cavity between the metal and the timber.This cavity is in some respects use ful, and I aim at retaining thesame, with my invention, but heretofore it has been found that byscrewingup the plate the same is distorted and bent, so that more orless close contact occurs, where the cavity was desired. r

According; to my invention a curved metal plate is folded along two,parallel edges which are parallel with the axis of curvature, the partsfolded over forming heads, at the bends, and then lying in part againstthe inside or concave face of the plate, their inner edges, however.being; bent away from the face of the plate to form flanges, whose depthis substantially equal to the depth of the beads. The radius of theplate curvaturesomewhat larger than the. radius of the post. I makeholes for screws in the double thickness of the plate, where it has beenfolded.

The plate'being placed against the post, touches the same only with thebeads and the flanges, if the portion between the flanges is left in theform of a segment of a cylinder, but I may'bend this part inwards, toform a channel or channels, so that a portion or portions thereof willabutagainst the post.

The screw inserted through the holes in the double thickness-of metalbetween the beads and flanges can be screwed in very tightly withoutsubstantially distorting the plate, because the beads and the flangesform strong and rigid abutments for taking the thrust. There ispractically no risk of so distorting any part of the plate that it willmake contact with the post, except with the beads and the edges of thefiancee, and with such other part as may have previously been bentinwards for the purpose of making contact. v 7

Two constructions according to the inven-' tion are shown in theaccompanying: drawmg, in Figs. 1 and 2 and in Figs. 3 and 4respectively. i

Fig. 1 is an elevation of a coupling plate, partly broken away, lookingto 'ards the concave face thereof, and i Fig. 2 is a cross section ofthis plate. applied to a post.

Figs. 3 and 41 are similar views of the second construction.

Referring first to Figs. 1 and 2. a is the cylindrically curved part ofthe plate. I). 7) are the beads, c the flanges, and (Z. (Z holes for theinsertion of screws, as shown at c in Fig. 2, f being the post.

In the construction shown in Figs. 3 and 4. the folding at the lateraledges is precisely similar to that shown in Figs. 1 and 2,

but the part it between the flanires has two sharp inward bends, as at70, to form a channelled part g which abuts against the post I mayprovide holes for screws in the part 9.

lVhatl claim as my invention and desire 1. A metal coupling plate forthe purpose set forth, curved and folded along two parallel edgesparallel with the axis of curvature, the folded portions forming); headsat the bends and lying in part against the concave face of the plate,and the inner edges of said folded parts being bent away fromsaidconcave face to form flanges.

2. A plate as claimed in claim 1. having holes for screws in the doublethickness of metal formed by the folding thereof.

3. A plate as claimed in claim 1, having a portion thereof bent to forma ridge between the flanges.

In wltness whereofI have signed specification.

OSKAR SCHUBERT.

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